Chrono Calcul: a mental math stadium where records matter

Chrono Calcul is an Android app that works like a mental math stadium: each school year is a track, each skill an event, and the child wears a bib to beat their own records. It covers grade 1 (CP) to grade 7 (5ème).

There are 74 events arranged in the order in which the notions are taught. Measuring time and improving a personal record is also the basis of any experiment that repeats a measurement.

Running your first event

1. Install Chrono Calcul from Google Play.
2. Select the track for your school year.
3. Pick an event, for example doubles and halves or multiplication tables.
4. Answer ten questions that become harder, aiming for three stars.
5. Read the explanation after any wrong answer and run again.

What you will find in the mental math stadium

• Seven tracks and 74 events, from complements to 10 to percentages, divisibility rules, order of operations, relative numbers and rounding.
• Four ways to run: training, a 60-second time attack, survival with three lives and a daily race of 15 questions.
• Questions generated at each game, so the child really calculates.
• Explanations that name the method, such as going through the ten or splitting a number.
• 40 medals, 15 ranks from a seed of calculation up to a legend, stars per event and a trophy per track.
• A big numeric keypad, English and French, and no advertising.

The app saves progress on the Google account, so it appears on another device.

Who this stadium is for

Primary pupils will find their year on the tracks, and middle school pupils up to grade 7 can revisit fractions, percentages and relative numbers.

The 60-second time attack is a good fit for competitive children, while the survival mode rewards careful ones. Parents can watch records and consecutive days of play.

From mental math to the laboratory

Speed and accuracy with numbers are scientific habits. Percentages, divisibility and proportionality appear in nearly every lesson of our physics and chemistry courses, and fast arithmetic leaves more attention for the experiment itself.

A good routine is five minutes on Chrono Calcul followed by a problem from the AP Physics 1 worksheets, repeated several times a week.

Records and rewards

Every event offers up to three stars, and each finished track ends with a trophy. The 40 medals fill a showcase, and the 15 ranks run from the first seed of calculation to the legend of mental math.

Personal records and consecutive days of play give a child a reason to return tomorrow. Because the app regenerates the questions at every game, a record means a real improvement and not a memorised sequence.

Parents can follow the progress through these records, without needing to read a long report.

Tips for regular training

• Practise a little every day to keep the streak going.
• Compare your time attack score once a week.
• Use the explanation after a mistake; it names a method you can reuse.
• Set one event as the weekly goal and aim for three stars.

Frequently asked questions

What is Chrono Calcul?

Chrono Calcul is an Android mental math app laid out as a stadium. Seven tracks match school years from grade 1 to grade 7, and 74 events train one skill each, with records and medals.

What modes does it offer?

There are four: training with ten questions per event, a 60-second time attack, a survival mode with three lives and a daily race of 15 questions that is identical for all players on the same day.

Is Chrono Calcul in English?

Yes. The store text says the interface is available in French and English, with no advertising. School years follow the French system, so grade 6 appears as 6ème and grade 7 as 5ème.

Does it explain mistakes?

Yes. After a wrong answer the app displays the correct one together with the method, such as going through the ten, splitting a number or relying on the multiplication tables, so the child learns from each error.